CritiqueBrainz source code is hosted on GitHub and Bitbucket. Bug tracker is located at http://tickets.musicbrainz.org/browse/CB. Documentation at https://critiquebrainz.readthedocs.org/.
- Fork this repository.
- Create a new branch.
- Make some changes and write good commit messages.
- Create new pull request on Bitbucket.
Create ticket in bug tracker. Try to provide a good description.
If you want to discuss something, go to #musicbrainz-devel IRC channel on irc.freenode.net. More info is available at https://wiki.musicbrainz.org/Communication.